These are Spring tech lowering springs. I had them in my 09' QC for about 6 months. they lower the truck 2" front and 3" rear. I dont know if they are a progressive rate spring or not but they rode near stock with my 22 inch wheels. Took them off the truck because i decided to lift it instead. i can provide pictures if interested. just dont have any taken right now. in asking $250 shipped in cont. US only.